fix: Error result returned in HasLink method

Signed-off-by: Sagilio <Sagilio@outlook.com>

NetCasbin.UnitTest/EnforcerTest.cs

@@ -1,8 +1,10 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Threading.Tasks;
+using NetCasbin.Extensions;
 using NetCasbin.Persist;
 using NetCasbin.Persist.FileAdapter;
+using NetCasbin.Rbac;
 using NetCasbin.UnitTest.Fixtures;
 using NetCasbin.UnitTest.Mock;
 using Xunit;
@@ -915,5 +917,24 @@ public void TestEnforceExApiLog()
         }
 #endif
         #endregion
+
+        [Fact]
+        public void TestEnforceWithMultipleRoleManager()
+        {
+            var e = new Enforcer(TestModelFixture.GetNewTestModel(
+                _testModelFixture._rbacMultipleModelText,
+                _testModelFixture._rbacMultiplePolicyText));
+
+            var roleManager = new DefaultRoleManager(5);
+            roleManager.AddMatchingFunc((arg1, arg2) => arg1.Equals(arg2));
+            e.SetRoleManager(roleManager);
+            bool result = e.Enforce("@adm-user", "org::customer1", "cust1", "manage");
+            Assert.True(result);
+
+            roleManager.AddMatchingFunc((arg1, arg2) => !arg1.Equals(arg2));
+            e.SetRoleManager(roleManager);
+            result = e.Enforce("@adm-user", "org::customer1", "cust1", "manage");
+            Assert.False(result);
+        }
     }
 }

NetCasbin.UnitTest/Fixtures/TestModelFixture.cs

@@ -40,6 +40,10 @@ public class TestModelFixture
         internal readonly string _rbacWithHierarchyWithDomainsPolicyText = ReadTestFile("rbac_with_hierarchy_with_domains_policy.csv");
         internal readonly string _rbacWithResourceRolePolicyText = ReadTestFile("rbac_with_resource_roles_policy.csv");
 
+        // https://github.com/casbin/Casbin.NET/issues/154
+        internal readonly string _rbacMultipleModelText = ReadTestFile("rbac_multiple_rolemanager_model.conf");
+        internal readonly string _rbacMultiplePolicyText = ReadTestFile("rbac_multiple_rolemanager_policy.csv");
+
         public Model.Model GetNewAbacModel()
         {
             return GetNewTestModel(_abacModelText);

NetCasbin.UnitTest/examples/rbac_multiple_rolemanager_model.conf

@@ -0,0 +1,16 @@
+[request_definition]
+r = sub, dom, obj, act
+
+[policy_definition]
+p = sub, dom, obj, act
+
+[role_definition]
+g = _, _, _  	# users and role hierarcies
+g2 = _, _		# organization hierarchies
+g3 = _, _		# functional hierarchies
+
+[policy_effect]
+e = some(where (p.eft == allow))
+
+[matchers]
+m = g(r.sub, p.sub, r.dom)

NetCasbin.UnitTest/examples/rbac_multiple_rolemanager_policy.csv

@@ -0,0 +1,9 @@
+// Policies
+
+// role and functions to permissions
+p, grp::system_admin, org::customer1, cust1, manage
+
+//
+// user => group mappings & group hierarchies
+//
+g, @adm-user, grp::system_admin, org::customer1

NetCasbin/CoreEnforcer.cs

@@ -167,6 +167,7 @@ public void SetWatcher(IWatcher watcher, bool useAsync = true)
         public void SetRoleManager(IRoleManager roleManager)
         {
             SetRoleManager(PermConstants.DefaultRoleType, roleManager);
+            ExpressionHandler.SetGFunctions();
         }
 
         /// <summary>